| Revision | 2737e23040266d8ffd8a569d1859da2b91cc1a48 (tree) |
|---|---|
| Time | 2021-04-30 01:31:13 |
| Author | Eric Hopper <hopper@omni...> |
| Commiter | Eric Hopper |
Tests for dup and dup2.
tests/simplefd.cpp (diff)| @@ -67,3 +67,106 @@ | ||
| 67 | 67 | } |
| 68 | 68 | } |
| 69 | 69 | } |
| 70 | + | |
| 71 | +SCENARIO( | |
| 72 | + "File descriptor objects have dup and dup2 methods that work as expected." | |
| 73 | +) { | |
| 74 | + GIVEN( | |
| 75 | + "A new opened file foo in a new temporary directory containing " | |
| 76 | + "some known text." | |
| 77 | + ) { | |
| 78 | + tempdir testdir; | |
| 79 | + static const char known_text[] = "This is just some known text."; | |
| 80 | + auto fooname = testdir.get_name() / "foo"; | |
| 81 | + using ::posixpp::fd; | |
| 82 | + using of = ::posixpp::openflags; | |
| 83 | + using fdf = ::posixpp::fdflags; | |
| 84 | + using ::posixpp::modeflags; | |
| 85 | + auto foo{ | |
| 86 | + fd::open( | |
| 87 | + fooname.native().c_str(), | |
| 88 | + of::creat | fdf::wronly, | |
| 89 | + modeflags::irwall | |
| 90 | + ).result() | |
| 91 | + }; | |
| 92 | + // Don't write out the trailing '\0'; | |
| 93 | + REQUIRE(foo.write(known_text, sizeof(known_text) - 1).result() == sizeof(known_text) - 1); | |
| 94 | + foo.close().throw_if_error(); | |
| 95 | + foo = fd::open(fooname.native().c_str(), fdf::rdonly).result(); | |
| 96 | + WHEN("The foo.dup() is called.") { | |
| 97 | + fd bar{ foo.dup().result() }; | |
| 98 | + | |
| 99 | + THEN("It results in a new valid file descriptor.") { | |
| 100 | + REQUIRE(bar.is_valid()); | |
| 101 | + REQUIRE(foo.as_fd() != bar.as_fd()); | |
| 102 | + } | |
| 103 | + AND_WHEN("You read one character from it.") { | |
| 104 | + char buf[1]; | |
| 105 | + REQUIRE(bar.read(buf, 1).result() == 1); | |
| 106 | + THEN("you read the first character of the known text.") { | |
| 107 | + REQUIRE(buf[0] == known_text[0]); | |
| 108 | + } | |
| 109 | + AND_WHEN("you then read one character from the original fd.") { | |
| 110 | + char buf2[1]; | |
| 111 | + REQUIRE(foo.read(buf2, 1).result() == 1); | |
| 112 | + THEN("that character is the second character of the known text.") { | |
| 113 | + REQUIRE(buf2[0] == known_text[1]); | |
| 114 | + } | |
| 115 | + } | |
| 116 | + } | |
| 117 | + } | |
| 118 | + WHEN("foo.dup2(foo) is called.") { | |
| 119 | + REQUIRE_NOTHROW(foo.dup2(foo).throw_if_error()); | |
| 120 | + THEN("foo is still valid") { | |
| 121 | + REQUIRE(foo.is_valid()); | |
| 122 | + } | |
| 123 | + THEN( "a byte read from foo is the first byte of known_text") { | |
| 124 | + char buf_foo[1]; | |
| 125 | + REQUIRE(foo.read(buf_foo, 1).result() == 1); | |
| 126 | + REQUIRE(buf_foo[0] == known_text[0]); | |
| 127 | + } | |
| 128 | + } | |
| 129 | + AND_GIVEN("Another file descriptor opened on the same file.") { | |
| 130 | + auto foo2{fd::open(fooname.native().c_str(), fdf::rdonly).result()}; | |
| 131 | + THEN("It is valid.") { | |
| 132 | + REQUIRE(foo2.is_valid()); | |
| 133 | + } | |
| 134 | + WHEN( | |
| 135 | + "One byte is read from each" | |
| 136 | + ) { | |
| 137 | + // Initialize to 0 to make sure they change when read into. | |
| 138 | + char buf_foo[1] = {}; | |
| 139 | + char buf_foo2[1] = {}; | |
| 140 | + REQUIRE(foo.read(buf_foo, 1).result() == 1); | |
| 141 | + REQUIRE(foo2.read(buf_foo2, 1).result() == 1); | |
| 142 | + THEN( | |
| 143 | + "it's the same byte, and the first byte of the known " | |
| 144 | + "text, demonstrating that they each refer to a different " | |
| 145 | + "underlying file descriptor." | |
| 146 | + ) { | |
| 147 | + REQUIRE(buf_foo2[0] == known_text[0]); | |
| 148 | + REQUIRE(buf_foo[0] == buf_foo2[0]); | |
| 149 | + } AND_WHEN("we dup2 the first fd to the second fd") { | |
| 150 | + foo.dup2(foo2).throw_if_error(); | |
| 151 | + THEN("foo2 is still valid, and can be closed") { | |
| 152 | + REQUIRE(foo2.is_valid()); | |
| 153 | + REQUIRE_NOTHROW(foo2.close().throw_if_error()); | |
| 154 | + } AND_WHEN ("we then read read a byte from each file.") { | |
| 155 | + char buff2_foo[1]; | |
| 156 | + char buf2_foo2[1]; | |
| 157 | + REQUIRE(foo.read(buff2_foo, 1).result() == 1); | |
| 158 | + REQUIRE(foo2.read(buf2_foo2, 1).result() == 1); | |
| 159 | + THEN( | |
| 160 | + "then we get the 2nd and 3rd bytes of known " | |
| 161 | + "text, demonstrating they now refer to the same " | |
| 162 | + "underlying file descriptor." | |
| 163 | + ) { | |
| 164 | + REQUIRE(buff2_foo[0] == known_text[1]); | |
| 165 | + REQUIRE(buf2_foo2[0] == known_text[2]); | |
| 166 | + } | |
| 167 | + } | |
| 168 | + } | |
| 169 | + } | |
| 170 | + } | |
| 171 | + } | |
| 172 | +} |
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